On Feb 9, 2011, at 6:55 PM, Sue Gardner wrote:

But I'm loathe to really say all that, because I know that the 10th
anniversary was a lot of work for people like Steven Walling
(Wikimedia fellow, on this list) and Jay Walsh (Head of Communications
for Wikimedia, and I think not on this list). Plus the planning for
that started significantly earlier. So the Wikimedia Foundation would
not be able to support an event geared for March as fully as we did
the 10th.

To add my two cents: I think a month is enough time to do something meaningful. Not hundreds of offline events with special swag like the 10th anniversary, but some kind of substantial participation in the day is feasible for sure. 

Steven Walling
Fellow at the Wikimedia Foundation
wikimediafoundation.org